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Holdawayite

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Formula:
Mn6(CO3)2(OH)7(Cl,OH)
System:
Monoclinic
Hardness:
3
Name:
For US petrologist, Michael Jon Holdaway (b. 1936).
This page provides mineralogical data about Holdawayite.


Classification of Holdawayite

Approved
Approval Year:
1986
5.BA.20

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
16b.4.2.2

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:1
11.12.2

11 : Carbonates
12 : Carbonates of Mn

Physical Properties of Holdawayite

Hardness (Mohs):
3

Optical Data of Holdawayite

Type:
Biaxial (-)
RI values:
nα = 1.644 nβ = 1.719 nγ = 1.721
2V:
Measured: 12° to 18°, Calculated: 16°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong

Chemical Properties of Holdawayite

Formula:
Mn6(CO3)2(OH)7(Cl,OH)
IMA Formula:
Mn62+(CO3)2(OH)7(Cl,OH)
Elements listed in formula:

Crystallography of Holdawayite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 23.437(5) Å, b = 3.3137(3) Å, c = 16.618(6) Å
β = 111.15(2)°
Ratio:
a:b:c = 7.073 : 1 : 5.015
Unit Cell Volume:
V 1,203.67 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction Data:
d-spacingIntensity
10.93 (100)
7.77 (40)
5.459 (80)
3.879 (70)
2.926 (40)
2.690 (60b)
2.589 (50b)

Type Occurrence of Holdawayite

Relationship of Holdawayite to other Species

5.BA.05AzuriteCu3(CO3)2(OH)2
5.BA.10GeorgeiteCu2(CO3)(OH)2 · 6H2O
5.BA.10Glaukosphaerite(Cu,Ni)2(CO3)(OH)2
5.BA.10Kolwezite(Cu,Co)2(CO3)(OH)2
5.BA.10MalachiteCu2(CO3)(OH)2
5.BA.10Mcguinnessite(Mg,Cu)2(CO3)(OH)2
5.BA.10NullaginiteNi2(CO3)(OH)2
5.BA.10PokrovskiteMg2(CO3)(OH)2
5.BA.10Rosasite(Cu,Zn)2(CO3)(OH)2
5.BA.10Zincrosasite(Zn,Cu)2(CO3)(OH)2
5.BA.10ChukanoviteFe22+(CO3)(OH)2
5.BA.15Aurichalcite(Zn,Cu)5(CO3)2(OH)6
5.BA.15HydrozinciteZn5(CO3)2(OH)6
5.BA.25DeferniteCa6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)
5.BA.25UM1977-03-COSiO:CaClHCa10-11(CO3)7(SiO4)Cl1-2(OH)1-2
5.BA.30Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10
5.BA.30Sclarite(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10
11.12.1RhodochrositeMnCO3
11.12.3DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
11.12.4KutnohoriteCa(Mn,Mg,Fe)(CO3)2

Other Names for Holdawayite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Holdawayite

Reference List:
American Mineralogist: 37: 637-642.

American Mineralogist: 73: 632-643.

Internet Links for Holdawayite

mindat.org URL:
https://www.mindat.org/min-1919.html
Please feel free to link to this page.

Localities for Holdawayite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • Rhineland-Palatinate
    • Lahn valley
Wittern: "Mineralfundorte in Deutschland", 2001
        • Frücht
Der Aufschluss Vol.55, March/April 2004
Namibia (TL)
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
American Mineralogist (1988): 73: 632-642.
Romania
 
  • Maramureș Co.
http://minerals-of-the-carpathians.eu; Udubasa, G., Hartopanu, P., Ilinca, G. (1996). The Regionally metamorphosed Fe-Mn Ore Deposit at Razoare, Preluca Mts., Romania. Romanian Journal of Mineralogy, 77, 3-20.
Mineral and/or Locality  
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